Endless printing ribbon cartridge



FIG. 1 is a top front and left side perspective view of an endless printing ribbon cartridge having the design of the invention;

FIG. 2 is a top rear and right side perspective view thereof;

FIG. 3 is left side elevational view thereof; and,

FIG. 4 is a bottom plan view thereof.

It is to be understood that the surface ornamentation of small circles is continuous throughout the area indicated on FIGS. 1 and 2. 

The ornamental design for an endless printing ribbon cartridge, as shown and described. 